Defining Polycentric Urban Areas Through Commuting Cohesion in France - Methods for Multilevel Analysis and Visualisation of Geographical Networks - page 189

Fig. 12.4 Betweenness centrality index around Bordeaux ( a ) and Lille ( b ), year 1982

Fig. 12.5 Betweenness centrality index around Bordeaux ( a ) and Lille ( b ), year 1990

In these figures, the strength metric has been applied to the graphs. The color
of each edge indicates the connectivity of each region. The areas drawn darker are
tightly connected while the areas in pale are loosely connected.

12.3.1.3 Participation Coefficient

The participation coefficient measures the closure of the subnetworks as well as
the intensity of the sub-centralities according to the contribution and participation
indexes ( Melançon et al. , 2008 ). These indexes gauge the contribution of each